Question

The micro-organisms double themselves in 3 h. Assuming that the quantity increases at a rate proportional to itself, then the number of times it multiplies themselves in 18 yr is ______.

Options

• 32

• 64

• 40

• 128

Answer 1

The micro-organisms double themselves in 3 h. Assuming that the quantity increases at a rate proportional to itself, then the number of times it multiplies themselves in 18 yr is 64.

Explanation:

Let the number of micro-organisms in the initial is n

Here, n will be 2n in 3 yr

∴ Number of micro-organism in 18 yr

= (2⁶)n = 64n

∴ 64 time of micro-organism in 18 yr.